Glass blow mold mechanism for glassware forming machines



Oct. 31, 1961 G. E. ROWE GLASS BLOW MOLD MECHANISM FOR GLASSWARE FORMINGMACHINES Original Filed Nov, 16. 1955 2 Sheets-Sheet 1 INVENTOP GEORGE EROWE A'T 'TOF-2 NEYS Oct. 31, 1961 G. E. ROWE 3,006,112

GLASS BLOW MOLD MECHANISM FOR GLASSWARE FORMING MACHINES Original FiledNov. 16, 1953 2 Sheets-Sheet 2 F i C3 L GEORGE E- ROVVE AT TOR NEYS3,006,112 GLASS BLOW MLD MECHANISM FOR GLASSWARE FRMNG MACHINES GeorgeE. Rowe, Wethersfield, Conn., assigner to Emhart Manufacturing Company,Hartford, Conn., a corporation of Delaware Original application Nov. 16,1953, Ser. No. 392,315. Divided and this application Feb. 3, 1958, Ser.No.

7 claims. (ci. 49-41) This application is a division of my co-pendingapplication, Serial No. 392,315 filed November 16, 1953, forimprovements in Glassware Forming Machines, and is filed for the purposeof claiming the invention thereof that is embodied in a novel blow moldmechanism or unit by which a suitable molten glass blank or parisondelivered to the blow mold thereof may be formed to provide a tumbler orother glass article of suitable external shape.

Such mechanism comprises an upright one-piece or block type blow mold, ablow head and a blow mold bottom plate. The blow mold has aicentralopening in its bottom and is open at its top. It is axially movablebetween a relatively raised, active position at a blowing station atwhich the blowing of the glass blank or parison to form the glassarticle of the nal shape desired occurs and a downwardly retracted,inactive position. The blow head is movable from a relatively raised,out-of-the-way position to a lowered, operative position on the openupper end of the `blow mold when the latter is in its raised position atthe blowing station and a suitable blank or palison has been deliveredthereto. The bottom plate is located constantly at the blowing stationin position to be seated in the central opening inthe bottom of the blowmold when the latter is raised to its active position at the blowingstation. The bottom plate remains in that position so that the finallyblown article will remain standing thereon when the blow head has beenremoved and the blow mold is stripped downwardly therefrom after ablowing operation, the walls of the cavity of the blow mold having adownward and inward taper from its open upper end to its bottom toprovide for such stripping.

The means for supporting the blow mold for axial movements between itsraised, active position at the blowing station and its lowered, inactiveposition and for reciprocating it between these two positions and themeans for maintaining the bottom plate constantly in a relatively xedposition at the blowing station are such as to permit the raisedposition of the blow mold and the relatively xed position of the blowmold bottom plate to be adjusted vertically in unison within limitswhile assuring maintenance of cooperative relationship of these parts atall vertically adjusted positions thereof.

A practical embodiment of the invention as shown in the drawings anddescribed in the specication of my co-pending parent application, SerialNo. 392,315, is shown in the yaccompanying drawings and described in thefollowing specification.

In the accompanying drawings: j

FIG. 1 is a vertical section through the improved blow mold mechanism;

FIG. 2 is a horizontal cross-section along the line 2 2 of FIG. l;

FIG. 3 is a fragmentary vertical cross-sectional view of the blow moldand associate parts during the blowing operation; and

' FIG. 4 is a vertical cross-sectional view like FIG.l but with the blowmold in a downwardly retracted position and with takeout tongs indicatedfor removal of the blown glass article.

The blow mold 35 at blowing station B is a one-piece or block-type moldinstead of the customary two-part blow mold. Blow mold 35 has adepending tubular stem 54. The lower end portion of this mold stem isindicated at 54a as iitting in a sleeve 55 and as having an externalflange 54b resting upon the upper end surface of this sleeve. The sleeve55 has a reduced lower end portion 55a tting in a counterbore 56a at theupper end of a vertical bore 56 formed through a tubular support orslide block 57. Bore 56 receives the upper end portion of a tubularpiston rod 58 which is pinned at 59 to block 57. Piston rod 5S extendsupwardly from a piston 60 that is reciprocable in a vertically disposedair cylinder 61. A spring-loaded latch pin 62 fastens the sleeve 55releasably to the blow mold stem and suitable fastening means, indicatedyby the cap screws 63, fasten the sleeve 55 to the underlying block 57.The arrangement permits selective use of different blow molds, which areintended for use in the production of various hollow articles of a widevariety of sizes and shapes.

The piston 66 and cylinder 61 comprise an air motor and are carried by aslide frame 69 and are adjustable vertically as a unit with relation toa fixed level support 64, being supported on the latter by an adjustingmechanism indicated at 65 in FIGS. 1 and 4. The clamping arrangementindicated at 66 is to maintain any height adjustment that has beeneffected by the `adjusting mechanism65.

The slide blockfor tubular support 57 is formed at its opposite sideswith a pair of integral veltical slide strips 67 which are disposed inthe outer part of a squarecornered guideway 68 in sliding contact withthe vertical outer edges of the anges of the slide frame 69 which isvertical and channel-shaped. The said slide strips and ilanges comprisecooperative slidably contacting guide elements on the tubular supportand slide frame respectively. Retaining strips 7@ are fastened by screws71 to a stationary part 72 of the machine structure. The verticalguideway 68 is formed in the stationary part 72 and the channel-shapedguide member 69 and part of the wall of cylinder 61 are disposed thereinfor vertical sliding movements relative thereto when adjusting means 65is operated.

An upward stroke of piston 60 in cylinder 61 from the lower end of thatcylinder as shown in FIG. 4 to the upper end thereof as in FIG. 1 willraise tubular piston rod 58, slide block 57, connecting sleeve 55 andthe blow mold 35 as a unit to the positions shown in FIG. 1. This upwardstroke of the piston may be effected by air under pressure admitted atthe bottom end of the cylinder, as by the pipe 73. Return of these partsto their lowered positions may be effected by the action of coil springs74 which have their upper ends fastened, as by pins 75, to slide block57 and their lower ends fastened to a crossrod 76 in the lower part of aspace 77 back of the slide block in the channel-shaped integral upwardextension 69 of the wall of cylinder 61, the cross rod being xed inplace in such extension.

A blow mold bottom plate 78 rits in a central opening 79 in the bottompart of mold '3S when the blow mold is in its raised position as shownin FIG. 1. This blow mold bottom plate is carried by a dependingvertical rod section 80 that extends slidably through the blow mold stemS4 into the bore 56 of slide block 57 where it is connected, as by abayonet joint 81, to the upper end of a vertical rod section 82 thatextends through the bore of the piston rod 58 and through a centralopening 83 in the piston downwardly to .the =bottom of the cylinder 6.1where it is fastened as by a pin 84 in a, socket 85 on the bottom end ofthe cylinder. The arrangement is such that when the blow mold is loweredin the manner described, the blow mold bottom plate 78 will remain atthe same level and hence the blow mold will be stripped downwardly froman article 86 that has been formed therein and which rests on therelatively raised bottom plate 78.

A blow head 88 that is carried and operated by conventional blow headoperating mechanism 39 is moved from a raised out-of-the-way positiondownwardly to an active position on the upper end of the blow mold 35 asshown in FIG. 3 and blowing air is supplied thereby into the parison S7to expand it against the walls of the blow mold cavity to form thearticle 86. In the example shown, article 86 is a tumbler but otherglass articles of different shapes and sizes may be made, molding partsof suitable shapes and sizes being selected and used as described.

After the blowing step has been completed, the blow head will bereturned to its raised inactive position, the air pressure within thelower part of cylinder 6l will be relieved so that the springs 74 willreturn the blow mold 35 downwardly to the position shown in FG. V4. Theblown article may be engaged by suitable takeout tongs, indicated at 90in FIG. 4, and lifted from .the blow mold bottom plate and deposited ona suitable conveyor (not shown) or other suitable support.

The external shape of the parison shall be appropriate for expansion inthe one-piece blow mold into an article from which the blow mold can bestripped downwardly.

lI claim:

l. In a glassware forming machine, an upright onepiece blow mold open atits upper end and havingl a central opening in its bottom and a rigidtubular stem depending from its bottom, a Vertical cylinder locatedbelow a blow mold station, a piston reciprocable in the cylinder, atubular piston rod extending upwardly from said piston toward the blowmold station, a slide block carried by the upper end of the tubularpiston rod, means operatively connecting the blow mold stem with saidslide block so that the blow mold is supported by said slide block inposition to be raised to said blow mold station when said piston is atthe upper end of its stroke in said cylinder and to be lowered to aposition below said blow mold station when said piston is returned tothe lower end of said cylinder, a blow mold bottom plate fitting theopening in the bottom of the -blow mold so as to be faisable therefromvertically upward in the blow mold, and supporting means for said bottomplate to maintain such plate in a raised position in relation to theblow mold when the latter is lowered from its active position at theblow mold station.

2. In a glassware forming machine, the combination speciiied by claim 1,wherein said means for supporting saidblow mold bottom plate comprises astationary vertical rod extending upwardly through the tubular pistonrod, the slide block, and the tubular stem of the blow mold and carryingthe blow mold bottom plate on its upper end.

3. In a glassware forming machine, the combination specified by claim l,wherein the piston is movable vertically on its upward stroke by airpressure and is lowered by spring action and, in addition, stationaryguiding lmeans for the slide block to prevent rotation thereof.

4. In glassware forming apparatus, a one-piece blow mold having its axisdisposed vertically and formed with a cavity, the walls of which taperdownwardly andinwardly, said mold having open upper and lower ends, abottom plate adapted at times to close the lower end of the mold and atall times positioned coaxially with the latter, meansA supporting thebottom plate at a xed elevation comprising a rod axially aligned withand depending from .the bottom plate, means for reciprocating the blowmold axially relative to the bottom plate whereby to position the latterat times at an elevation above the upper end of the blow -mold for theremoval of a nished article of glassware resting upon said bottom plate,the blow mold lreciprocating means comprising a tubular supporttelescoped over the bottom plate supporting rod and a piston motoroperable to reciprocate the tubular support.

5. In .glassware forming apparatus, a one-piece blow mold having itsaxis disposed vertically and formed with a cavity, the Walls of whichtaper downwardly and inwardly, said mold having open upper and lowerends, a bottom plate adapted at times to close the lower end of the moldand at all times positioned coaxially with the latter, means supportingthe bottom plate at a fixed elevation comprising a rod axially alignedwith and depending from the bottom plate, means for reciprocating theblow mold axially relative to the bottom plate whereby to position thelatter at times at an elevation above the upper end of the blow mold forthe removal of a finished article oi' glassware resting upon said bottomplate, the blow mold reciprocating means comprising a tubular supporttelescoped over the bottom plate carrying rod, a separable connector forattaching the mold to the upper end of the tubular support, a pistonmotor operatively connected to the lower end of the tubular support forreciprocating the latter and means for` adjusting the operatingpositions of the mold and bottom plate.

6. In glassware forming apparatus, a one-piece blow mold having its axisdisposed vertically and formed with a cavity, the walls of which taperdownwardly and inwardly, said mold having open upper and lower ends, abottom plate adapted at times to close the lower end of the mold and atall times positioned coaxially with the latter, means supporting thebottom plate at a fixed elevation comprising a rod axially aligned withand depending from the bottom plate, means for reciprocating the blowmold axially relative to the bottom plate whereby to position the latterat times at an elevation above the upper end of the blow mold for theremoval of a finished article of glassware resting upon said bottomplate, the blow mold reciprocating means comprising a tubular supporttelescoped over the bottom plate carrying rod, a separable connector forattaching the mold to the upper end of the tubular support, a pistonmotor operatively connected to the lower end of the tubular support forreciprocating the latter, means for adjusting the operating positions ofthe mold and bottom plate, the bottom plate and blow mold adjustingmeans comprising a vertically movable slide frame carrying said motorand the supports. for the bottom platre and blow mold and means foradjusting the position of the slide frame vertically.

7. ln glassware forming apparatus, a one-piece blow' moldl having itsaxis disposed vertically and formed with a cavity, the walls of whichtaper downwardly and inwardly, said mold having onpen upper and lowerends, a bottom plate adapted at times to close the lower end of the moldand at all times positioned coaxially with the latter, means supportingthe bottom plate at a fixed elevation comprising a rod axially alignedwith and depending from the bottom plate, a tubular support for the blowmold telescoped over the bottom plate supporting rod, a piston motorconnected to the lower end of the tubular support for reciprocating thelatterand correspondingly moving the blow mold relative to the bottomplate, a vertically movable slide frame upon which the motor and thesupports for the bottom plate and blow mold are mounted, and cooperativeslidably contacting guide elements on said tubular support and saidslide frame, respectively.

References Cited in the le of this patent UNITED STATES PATENTS2,050,386 schutz Aug. 11, 1936

